Cool thanks. I think this might work. Cheers for this - really great idea and help!!
On Domh 16 MFómh 2018 at 17:21, Johannes Radinger < [email protected]> wrote: > To me this looks like a flooding-related question, i.e. to extract the > shore lines of a river if it's water level is raised by 1m or 3m? > Maybe (1) extract the raster cells of the elevation map that represents > the river channel, (2) then apply r.grow and (3) then r.mapcalc to subtract > the grown river channel from the original elevation map. > /Johannes > > On Sun, Sep 16, 2018 at 5:16 PM Markus Neteler <[email protected]> wrote: > >> Hi, >> >> Shane Carey <[email protected]> schrieb am Fr., 14. Sep. 2018, 23:02: >> >>> Hi All, >>> >>> Does anyone know is it possible to calculate the elevation above a river >>> channel (actual river network that was digitised as opposed to being >>> extracted from a DTM) from a DTM and create a polygon from it. >>> >>> I need to calculate heights of 1m and 3m above a river channel on both >>> sides of the channel and create a polygon from it. >>> >> >> This isn't clear to me. Could you elaborate? >> >> Best >> Markus >> >> >> Thanks all. >>> >>> Le gach dea ghui, >>> *Shane Carey* >>> *GIS and Data Solutions Consultant* >>> _______________________________________________ >>> grass-user mailing list >>> [email protected] >>> https://lists.osgeo.org/mailman/listinfo/grass-user >> >> _______________________________________________ >> grass-user mailing list >> [email protected] >> https://lists.osgeo.org/mailman/listinfo/grass-user > > -- Le gach dea ghui, *Shane Carey* *GIS and Data Solutions Consultant*
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